Adjustable bucking-up tool with interchangeable dies



y 1931. H. N. EVANS, SR I 1,803,965

ADJUSTABLE BUCKING-UP TOOL WITH INTERCHANGEABLE DIES Filed Feb. 28, 1928Patented May 5, 1931 UNITED STATES PATENT oi-FicfE HARRY N. EVAN-S, $3.,01? PHILADELPHIA, PENNSYLVANIA Application filed February 28, 1928.Serial No. 257,667.

The object of the invention is to provide improvements in the bucking-uptools or dollies, used by steel workers in the erection of skeleton workfor office buildin 's, hotels,

5 bridges, elevated railways, and the like, and particularly in theprovision for interchangeability of the dies thereof as an inherentcharacteristic.

Heretofore, the bucking-up tool has comprised a weight of approximatelythirty-five pounds which even the most experienced and strong man canhold effectively for only a half day or thereabouts. These weights, ordollies as they are generally known, are provided with recesses of givensize for the reception and maintenance of the round shape of the rivethead, as the riveter operates with his usual pneumatic hammer. upon theopposite or heated end of the rivet. Consequently, several such dolliesmust be carried and one substituted for another every time that a rivetof different size is to be set.

Furthermore, there are many occasions when a dolly of the usual formcannot be used to advantage if at all, and other special shapes must besubstituted in accordance with the individual demands of the situation,such for instance as what is known as a heel dolly or a spring dolly.Therefore, an object of the invention is to provide a single tool forthis purpose with only one or two extra parts of small size, and thesame tool being adapted for use in practically any known position andunder practically any known circumstances. With these and other objectsin mind, the present invention comprises further details of constructionand operation which are fully brought out in the following descriptionwhen read in conjunction with the accompanying drawings, in which Fig. 1is a side elevation of one embodiment of the invention, though not aslong proportionately as would probably be employed in the majority ofcases to provide for a pressure of at least thirty-five pounds or soupon a rivet, upon the exertion of a downward pressure of an ordinarymans weight; Fig. 2 is a bottom plan view of the same; Fig. 3 is a sideelevation of the same tool equipped with a heel so instead of a clamp;and Fig. 4 is a similar view of the tool equipped with a suspensionsupport as hereinafterdescribed. Referring to Figs. 1 and 2, a shank 5terminates at one end with a hand-engaging portion or handle 6, and uponits upper surface may be provided with spaced apertures 7.

The opposite end of said shank is transversely enlarged to provide ahead 8, having a normally vertically extending bore 9 in which isfrictionally secured, by means of a circular, radially outwardlyexpansible spring 10, the stem 10 of a die which alsov comprises a head11, having a convex recess 12 of the proper size and curvature toconform to the head 13 of a rivet 14, the other end 15 of which is uponthe opposite side of a plurality of members 16, which may be adjacentflanges of a pair of angle irons, I- beams, or the like, either or bothof which extend laterally towards a free edge portion well removed fromsaid rivet.

' The die 11 represents one of a number of. different sizes such as /1,1, 1 and 1 which sizes are most commonly used in structural steel work.The shank of the die is provided with an annular groove 17 into which isradially contractible the circular wire spring 18, which tends to pressoutwardly against'the surrounding surface of the bore 9, to yieldinglyprevent the removal but permit the free rotation of said die, which maybe removed for replacement by prying with a screw driver or similarlyedged'instrument beneath the head 11, after which a die of differentsize may be substituted therefor.

Slidably mounted upon and surrounding the shank 5 is a collar 20 of anydesired shape and preferably provided with oppositely directedextensions 21 operative to increase the longitudinal cooperation of saidcollar with said shank to prevent tilting of the former upon the latter.From said collar rises an integral projection 22, terminating in ahorizontally extending arm or gooscncck bracket 23, through which passesan adjustable screw 24 having a preferably pointed free end adapted toengage and bite into the surface of the upper of said members 16, whilesaid screw terminates upwardly in a head 24 of any desired type, such asa knurled head for finger engagement, a polygonal head for wrenchengagement, or otherwise as may be desired, but preferably provided witha diametrically extending bore 25, adapted to receive a pin 26 (shown indotand-dash lines), a nail, or other device, for aiding in manuallytightening the screw. A lock nut 26 may also be added if desired.

The collar projection 22 is preferably provided with a recess 27,containing a compression spring which presses a pin 28 into any one ofthe apertures 7 of the tool shank that may be desired, said pin beingreleased to permit readjustment of said collar by manually raising astud 29, which extends laterally from said pin through an elongated slot30 in the wall of said recess. Said collar may also be provided, ifdesired, with a threaded recess 31 in its under side for the receptionof an adjustable heel pin 32, shown in dot-and-dash lines, in which caseinstead of the collar being positioned as shown, it may be removed fromthe shank 5 and reversed so as to shift the arms 23 out of the way of apneuamtic hammer, or gun, as it is frequently called, when the latter isin engagement with the rivet head and it is necessary to position theheel 32 as far beneath the die as possible.

Referring to Fig. 3, the collar is replaced by a collar 33, the underside of which is provided with a threaded aperture 34 into which isadapted to be screwed an adjustable pin adapted to engage a suitablerest 35. To adjustably secure the collar 33 in a given position upon theshank 5, the former is provided with an arm 34 paralleling and closelyadjacent to said shank, and provided witha set screw 35, frictionallyengaging said shank and having any desired type of head 36, throughwhich extends a bore 37 adapted to receive a pin or nail to aid inmanually adjusting said screw. Or said collar may be reversed so thatsaid screw is free to enter and engage the threaded lower end portion ofthe bore 9 in the shank head 8, as shown in dotted lines.

Finally, referring to Fig. 4, it will be apparent that the uppermostportion of the collar 33 may be provided with a threaded aper ture 38into which is removably secured an adjustable hooked member 39, thepresence of which transforms the tool into a spring dolly. This resultmay also be obtained by removing and inverting the collar 33, so thatthe aperture 34 is uppermost, in which case it, instead of the aperture38, receives the hooked member 39, which in either case is supported bythe depending eye 40 of a seed clamp 41, the upper end of which latteris adjusted vertically with respect to the overhanging supportin member42 by means of a set screw 43, carried by the former and ditearyngagingthe latter.

In the operation of this tool in any of the forms described, downwardpressure upon the handles 6 causes a multiplied upward pressure upon thedies 11, depending upon the position of the point of support or fulcrum,whether it be the pin 24 in Fig. 1, the heel 35 in Fig. 3, or the hook39 and seed clamp 41 in Fig. 4. When a laterally extending portion ofthe members being riveted is available as in Fig. 1, the bracket 2024 isemployed; when no such extension is available but an underlying base orrest is present as represented in Fig. 3, the heel support is employed;and when neither lateral extension, nor underlying support is present,but overhanging support available, the suspension shown in Fig. 4 isused. Thus, in Fig. 1 for example, the shank 5 comprises a mechanicallever composed of the usual power and work arms, namely, the manuallyengageable and diesupporting end portions 6 and 8, respectively, whilethe member 24 carried by the bracket 23 serves as a fulcrum with respectto and when in engagement with the member 16.

In all such arrangements a physical lever of the first class is providedand a very great amount of upward pressure can be exerted upon a rivetby a downward pressure upon the tool handle represented by only a smallportion of a mans weight, the downward pressure upon the handles beingrelated to the upward pressure upon the rivet, as the length of theweight arm from the fulcrum to the point of applied pressure is to thelength of the power arm from the fulcrum to the point of contact with arivet.

Having thus described my invention what I claim and desire to protect byLetters Patent of the United States is:

1. A bucking-up tool, comprising a shank,

forming a lever and terminating in one direction in a manuallyengageable portion constituting a lever power arm, a rivetengage abledie supported by the opposite end portion of said shank whichconstitutes a lever work arm and angularly disposed with respectthereto, a bracket having a gooseneck extension adapted to partiallysurround and overhang a member being riveted to provide a fulcrum, and s'iring-pressed means to adjustablysecu-re said bracket longitudinallyupon and with respect to said shank, to vary the ratio between the powerand work arms of the lever. V

2. A bucking-up tool, comprising an elongated lever shank providing amanually engageable end portion constituting a power arm and its otherend constituting a work arm and having a transverse bore, arivet-engaging die extending into said hole, access to the rear of saiddie for the purpose of removal being t'h'rough'the opposite end of saidbore, a bracket slidable longitudinally upon said shank towards and awa-from said die, "spring-pressed means carried said signature.

HARRY N. EVANS, SR.

